Using an electrically controllable (EC) Echelette grating which consists of numerous thin glass-plates on a unimorph transducer, the wavelength selection and intracavity modulation are demonstrated at CO2 10.6 µm laser, together with the basic characteristics of the grating and theoretical treatments. Under intracavity setting of the grating in three-mirror configuration of a resonator, the initially oscillated CO2 line, P22, is typically moved into P18 line with 100V applied to the grating. On the intensity modulation, about 30% of modulation is also obtained with only 10 V.